import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import Welcome from '../components/Welcome.vue'
import Users from '../components/user/Users.vue'
import Cate from '../components/goods/Cate.vue'
import GoodsList from '../components/goods/List.vue'
import Add from '../components/goods/Add.vue'

Vue.use(VueRouter)

const routes = [
  {
    path: '/',
    redirect:'/login'
  },
  {
    path: '/login',
    component:Login
  },
  {
    path: '/home',
    component:Home,
    redirect:'/welcome',
    children:[
      {path:'/welcome',component:Welcome},
      {path:'/users',component:Users},
      {path:'/categories',component:Cate},
      {path:'/goods',component:GoodsList},
      {path:'/goods/add',component:Add}
    ]
  }
]

const router = new VueRouter({
  routes
})

// 挂载路由导航守卫
router.beforeEach((to,from,next)=>{
  // to 将要访问的路径
  // from 代表从哪个路径跳转而来
  // next 是一个函数，表示放行
  // next() 放行 next('/login') 强制跳转
  if(to.path === '/login'){
    return next()
  }else{
    // 获取token
    const tokenStr = window.sessionStorage.getItem('token')
    if(!tokenStr){
      return next('/login')
    }else{
      return next()
    }
  }
})

export default router
